To test I plug in a 12v source and try by plugging a multimeter on the output and turning on the blue trim potentiometer it's fix at 12v however I turn it up or down what could be wrong ?
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Re: brand new buck converter does not step up or down
Are you sure that you are turning the pot control for the voltage because one is voltage and the or one is current9 PC LCD Monitor
6 LCD Flat Screen TV
30 Desk Top Switching Power Supply
10 Battery Charger Switching Power Supply for Power Tool
6 18v Lithium Battery Power Boards for Tool Battery Packs
1 XBox 360 Switching Power Supply and M Board
25 Servo Drives 220/460 3 Phase
6 De-soldering Station Switching Power Supply 1 Power Supply
1 Dell Mother Board
15 Computer Power Supply
1 HP Printer Supply & Control Board * lighting finished it *
These two repairs where found with a ESR meter...> Temp at 50*F then at 90*F the ESR reading more than 10%
1 Over Head Crane Current Sensing Board ( VFD Failure Five Years Later )
2 Hem Saw Computer Stack Board
All of these had
CAPs POOF
All of the mosfet that are taken out by bad caps -
Re: brand new buck converter does not step up or down
You don't have a load, so it likely just charged the output cap to the highest voltage.Comment
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Re: brand new buck converter does not step up or down
to be sure I tried both but I know that the left trim is for volts if viewed from aboveOriginally posted by sam_sam_sam View PostComment
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Re: brand new buck converter does not step up or down
do you need load to test? if so can you explain further pleaseOriginally posted by R_J View PostComment
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Re: brand new buck converter does not step up or down
Probably for best results because this is a buck converter not a boost converter which as adjustable the voltage control your voltage would go beyond the input voltage but on a buck converter it is the opposite in that you have to have some load on it for the voltage control to work but the current control also affects the voltage outputLast edited by sam_sam_sam; 08-30-2022, 07:54 PM.9 PC LCD Monitor
6 LCD Flat Screen TV
30 Desk Top Switching Power Supply
10 Battery Charger Switching Power Supply for Power Tool
6 18v Lithium Battery Power Boards for Tool Battery Packs
1 XBox 360 Switching Power Supply and M Board
25 Servo Drives 220/460 3 Phase
6 De-soldering Station Switching Power Supply 1 Power Supply
1 Dell Mother Board
15 Computer Power Supply
1 HP Printer Supply & Control Board * lighting finished it *
These two repairs where found with a ESR meter...> Temp at 50*F then at 90*F the ESR reading more than 10%
1 Over Head Crane Current Sensing Board ( VFD Failure Five Years Later )
2 Hem Saw Computer Stack Board
All of these had CAPs POOF
All of the mosfet that are taken out by bad capsComment
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Re: brand new buck converter does not step up or down
please look at this from minit 12 https://www.youtube.com/watch?v=9--_jaxiXhE&t=16sOriginally posted by R_J View PostComment
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Re: brand new buck converter does not step up or down
What happens when you put a load on the output dose it charge at all9 PC LCD Monitor
6 LCD Flat Screen TV
30 Desk Top Switching Power Supply
10 Battery Charger Switching Power Supply for Power Tool
6 18v Lithium Battery Power Boards for Tool Battery Packs
1 XBox 360 Switching Power Supply and M Board
25 Servo Drives 220/460 3 Phase
6 De-soldering Station Switching Power Supply 1 Power Supply
1 Dell Mother Board
15 Computer Power Supply
1 HP Printer Supply & Control Board * lighting finished it *
These two repairs where found with a ESR meter...> Temp at 50*F then at 90*F the ESR reading more than 10%
1 Over Head Crane Current Sensing Board ( VFD Failure Five Years Later )
2 Hem Saw Computer Stack Board
All of these had CAPs POOF
All of the mosfet that are taken out by bad capsComment
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Re: brand new buck converter does not step up or down
have not tried yet, but I will do and get back to you. normally you should be able to test even without loadOriginally posted by sam_sam_sam View PostComment
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Re: brand new buck converter does not step up or down
no, because the output cap holds a charge, and the charge is going into the chips feedback pin.
unless your output cap(s) have a discharge resistor you never power up without a loadComment
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Re: brand new buck converter does not step up or down
Clear and concise explanation thank youOriginally posted by stj View PostComment
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